Surat At-Tawbah (58-59)

{وَمِنْهُم مَّن يَلْمِزُكَ فِي الصَّدَقَاتِ فَإِنْ أُعْطُواْ مِنْهَا رَضُواْ وَإِن لَّمْ يُعْطَوْاْ مِنهَا إِذَا هُمْ يَسْخَطُونَ} [التوبة: 58]

58- Some of the hypocrites rebuke you in regard to the distribution of charities because of their financial interests. So, if you give them part of these charities until they are satisfied, they shall be glad and thank you, but if you do not give them part of them, they shall become angry and disapprove your action.

It was reported in Sahih Al Bukhari that the Ayah was revealed in regard to a Kharijite person who said: O Messenger of Allah, be just. You can see the full story in Fathul-Bary.

{وَلَوْ أَنَّهُمْ رَضُوْاْ مَا آتَاهُمُ اللّهُ وَرَسُولُهُ وَقَالُواْ حَسْبُنَا اللّهُ سَيُؤْتِينَا اللّهُ مِن فَضْلِهِ وَرَسُولُهُ إِنَّا إِلَى اللّهِ رَاغِبُونَ} [التوبة: 59]

59- If they had satisfied with the distribution of Allah and His Messenger to them and said: Allah (Alone) is Sufficient for us, and He is the Best Disposer of affairs for us. He shall give us from His Bounty and Favors what we need. Indeed, we desire that Allah would give us of His Bounty and Favor, make us give us charities and peoples' money, it would have been better and great for them.